Efficient bio-degradation of food waste through improving the microbial community compositions by newly isolated Bacillus strains

•The novel microbial agent improved food waste reduction process stability.•The volatile solids removal efficiency was improved by 9.76%.•Bacillus in inoculum was dominant genus in FW IRBR using the novel microbial agent.•Bacillus in inoculum was positively correlated with urease, amylase, and prote...

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Bibliographic Details
Published in:Bioresource technology 2021-02, Vol.321, p.124451, Article 124451
Main Authors: Zhou, Shi-Peng, Zhou, Hai-Yan, Xia, Shu-Ning, Ying, Jia-Min, Ke, Xia, Zou, Shu-Ping, Xue, Ya-Ping, Zheng, Yu-Guo
Format: Article
Language:English
Subjects:
Bacillus
Bacillus sp
Bacterial community
Bio-degradation
biodegradation
Biodegradation, Environmental
community structure
cost effectiveness
ecological succession
enzyme activity
Food
Food waste
high-throughput nucleotide sequencing
microbial communities
Microbiota
organic matter
Refuse Disposal
technology
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Summary:•The novel microbial agent improved food waste reduction process stability.•The volatile solids removal efficiency was improved by 9.76%.•Bacillus in inoculum was dominant genus in FW IRBR using the novel microbial agent.•Bacillus in inoculum was positively correlated with urease, amylase, and protease. This study aims to screen high-degradability strains and develop a novel microbial agent for efficient food waste degradation. The effects of the novel microbial agent on organic matter degradation, enzyme activity, and bacterial succession during the in-situ reduction of food waste were evaluated and compared with other two microbial agents previously developed. Results showed that the novel agent containing four Bacillus strains received maximum organic degradation rates, volatile solid removal (46.91%) and total mass reduction (76.16%). Pyrosequencing analysis revealed that there was a significant difference in the microbial community structure of the matrix among the three biodegradation systems, and the novel agent greatly improved the stability of in-situ reduction process that Bacillus was the dominant genus (>98%) since day 4. These results indicated that the inoculant containing only Bacillus was more stable and cost-effective in FW in-situ reduction.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2020.124451